Re: C to D conversion for function

[Timon Gehr]

On 04/29/2013 12:57 PM, Sumit Raja wrote:

Hi,

I wanted some help in converting this

void av_log_ask_for_sample(void *avc, const char *msg, ...)
av_printf_format(2, 3);

from C to D.

I don't know what it means or is called in C to start with so I am a bit
lost on what to search for.

Thanks

Sumit


av_printf_format is a preprocessor macro that expands to a built-in 
compiler attribute which enables compile-time printf-style format string 
checking. There is no support for such a feature in any D compiler.


You want

void av_log_ask_for_sample(void* avc, const(char)* msg, ...);


In case you want to preserve the attribute:

struct av_printf_format{ int fmtpos, attrpos; }

@av_printf_format(2, 3) void av_log_ask_for_sample(void* avc, 
const(char)* msg, ...);

Re: C to D conversion for function

[1100110]

On 04/29/2013 06:50 AM, Timon Gehr wrote:
 On 04/29/2013 12:57 PM, Sumit Raja wrote:
 Hi,

 I wanted some help in converting this

 void av_log_ask_for_sample(void *avc, const char *msg, ...)
 av_printf_format(2, 3);

 from C to D.

 I don't know what it means or is called in C to start with so I am a bit
 lost on what to search for.

 Thanks

 Sumit
 
 av_printf_format is a preprocessor macro that expands to a built-in
 compiler attribute which enables compile-time printf-style format string
 checking. There is no support for such a feature in any D compiler.
 
 You want
 
 void av_log_ask_for_sample(void* avc, const(char)* msg, ...);
 
 
 In case you want to preserve the attribute:
 
 struct av_printf_format{ int fmtpos, attrpos; }
 
 @av_printf_format(2, 3) void av_log_ask_for_sample(void* avc,
 const(char)* msg, ...);
 

What is the difference between const(char)*, and const(char*)?  I have
seen them used pretty much interchangeably...

Are they? Somehow I don't think they are.

Re: C to D conversion for function

[Timon Gehr]

On 04/29/2013 02:17 PM, 1100110 wrote:

...
What is the difference between const(char)*, and const(char*)?  I have
seen them used pretty much interchangeably...

Are they? Somehow I don't think they are.



Variables of type const(char)* can be mutated, while const(char*) cannot be.

void main(){
const(char)* a = 123.ptr;
*a = 2;// error
a = 456.ptr; // ok
const(char*) b = 123.ptr;
*b = 2;// error
b = 456.ptr; // error
}

Re: C to D conversion for function

[Sumit Raja]

On Monday, 29 April 2013 at 11:50:21 UTC, Timon Gehr wrote:


In case you want to preserve the attribute:

struct av_printf_format{ int fmtpos, attrpos; }

@av_printf_format(2, 3) void av_log_ask_for_sample(void* avc, 
const(char)* msg, ...);


Thanks. What does @av_printf_format(2, 3) do to the function?